How to Use a Pestle and Mortar for Spices

By Robert Welch® Designs | Stainless-steel cutlery, knives & cookware | Published: 2026-10-28

Category: How-to Guides

Learn the proper technique for grinding spices with a pestle and mortar, including common mistakes to avoid and tips for getting the best flavor.

Quick Answer

To get the best flavor from your spices, use a pestle and mortar with a firm, twisting motion, grinding in small batches and stopping before the spices turn to dust.

Why Use a Pestle and Mortar?

Grinding spices fresh with a pestle and mortar releases essential oils and aromas that pre-ground spices lose over time. The process gives you control over the texture, from coarse to fine, which is ideal for different recipes. Unlike electric grinders, a mortar lets you feel the spices as they break down, so you can stop at the perfect consistency.

Choosing the Right Mortar

The material of your mortar affects the grinding process. Cast iron mortars are durable and heavy, making them excellent for crushing tough spices like peppercorns and cumin seeds. The matt black finish of the Robert Welch Pestle & Mortar Small also adds a classic look to your kitchen. Its compact size (50mm high, 65mm wide) is perfect for small batches, though you may need a larger one for bigger quantities.

Step-by-Step Guide to Grinding Spices

Prepare the Spices: Measure the amount of spices you need and remove any stems or debris. For whole spices, consider toasting them in a dry pan first to enhance their flavor. Start with small batches; overfilling the mortar makes grinding uneven.
Add Spices to the Mortar: Place the spices in the mortar, filling it no more than one-third full. This leaves room for the pestle to move and prevents spices from spilling out. If the mortar is too full, the spices will scatter and grind inconsistently.
Grind with a Twisting Motion: Hold the pestle firmly and press down while twisting in a circular motion. Start with a gentle tap to crack the spices, then increase pressure as they break down. Avoid pounding too hard; a steady twist is more effective and prevents splashing.
Check the Consistency: Stop occasionally to check the texture. For coarse grinds, stop early; for fine powder, continue grinding until you reach the desired fineness. Grinding too long can turn spices into dust, which may burn when cooking.
Transfer and Clean: Use the pouring channel to transfer the ground spices to your dish. Clean the mortar and pestle with warm water and a brush; avoid soap on cast iron to prevent rust. Dry immediately after washing to keep the cast iron in good condition.

Recommended Product

Pestle & Mortar Small: This pestle and mortar is made from cast iron with a matt black finish and features an elongated pouring channel. The cast iron construction is sturdy for grinding tough spices, and the pouring channel makes it easy to transfer ground spices without spills.
Pestle & Mortar Small